The Days of Our Ridazz.

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Increasing the rear wheel diameter on your recumbent will do two things: raise the gearing, and change your steering geometry. The bike will steer quicker and may be less stable. You can change the gearing a lot easier with chain ring or cog swaps.

More inertia? Yes, of course. But that will mean more power required to spin up or accelerate. You can get more inertia by swapping for a steel wheel of the same size, but I don't think this is what you want to do.

About the best you can do is install high performance tyres and gear up if necessary. And adjust the recline of your seat as far back as you can to minimalize air resistance at speeds over 15 mph.
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Bikes with a lower center of gravity will steer quicker. This of course being that everything else is the same.

Some of the current speed records held are on small wheels. The fastest speed on an upright bike is over 51 mph and on 17 inch wheels. The fastest speed on a bike, 152 mph was set on 20 inch wheels. And the fastest speed un-assisted, over 81 mph were on 24 inch wheels.

What makes the taller wheel faster is that it rolls over bumps, dips and holes better than smaller wheels. Eliminate that, and smaller wheels are faster and easier to keep up at speed.

Well, my seat will not lean very far back on my bike without forcing my knees into my face.

So, in the near future, I'm looking into an Under-seat, steering 20"/26" model from Actionbent.
Cool thing about these ones is the fact that any store-bought accessories will go on without any problems, and they're more compact for buses, trunk storage., etc

Which will be a plus for the day I'm finally able to get back Over-The-Road.

even with extra idlers (is that what they are called?), having a frame that isnt perfectly straight would be like having your chain be in the big ring of the front ring and the small in the back. it would rub on the derailleur and cause lots of problems. your chain would wear out 100x quicker, the chain would come off the gears more than it should, it would be super noisy, etc etc.